Discrete semiconductors and inductors: BC547, 2N2222, TIP122 and 2N3055 transistors, IRFZ44 and IRF540 MOSFETs, BFW10 JFETs, BT136 TRIACs and SCRs, 1N4007 and 1N4148 diodes, zener diodes from 3.3V to 24V, Schottky and germanium diodes, bridge rectifiers, axial inductors and ferrite cores.